Effect of ph or nutrient availability, Biology

Effect of pH or Nutrient Availability

One of the greatest influence of pH on plant growth is through its effect on the nutrient availability. When base saturation is less than 100 per cent, an increase in pH is associated with an increase in the amount of calcium and magnesium in the soil solution, because calcium and magnesium are usually the dominant exchangeable bases. Many studies have shown that plant growth is promoted with increase in percentage of calcium in plants, which in turn is governed by the increasing pH or percentage base saturation. The general relationship between pH and availability of calcium and magnesium and other nutrients is shown in figure below.

1727_realation to soli ph.jpg

Availability of molybdenum increases at higher pH (see figure above). At low pH, molybdenum forms insoluble compounds with iron and is rendered unavailable. Under these conditions, plants like cauliflower, clover and citrus will suffer from molybdenum deficiency but will show better perfonnance when soil pH is increased. Potassium availability is usually good in alkaline soils that reflect the limiting leaching and removal of exchangeable potassium. The availability or solubility of some plant nutrients decreases at higher pH. Iron and manganese which are generally deficient in calcareous soils are two good examples. Phosphorus and boron also tend to be unavairable in acid soils. On the other hand copper and zinc have reduced availabiliry in both highly acidic and alkaline soils. The overall nutrient availability is good at close to pH 6.5.

Another aspeq of soil chemistry not indicated in the figure above is that at extremes of pH, the balance among nutrients becomes unfavourable, and certain nutrients become excessively soluble as to be toxic. For example, at low pH Al, Fe, Mn, Zn and Cu are excessively released to become toxic. The H and OH ions themselves are directly injurious below pH 4 or above 9.

 

Posted Date: 12/11/2012 2:43:25 AM | Location : United States







Related Discussions:- Effect of ph or nutrient availability, Assignment Help, Ask Question on Effect of ph or nutrient availability, Get Answer, Expert's Help, Effect of ph or nutrient availability Discussions

Write discussion on Effect of ph or nutrient availability
Your posts are moderated
Related Questions
Define Anaerobic Exercise or Energy System? Thus, exercises which are done for short bursts of time lasting only for few seconds (less than 120 sec) use only anaerobic system o

Q. What are the intermediate and the definitive hosts of the plasmodium? In the life-cycle of the plasmodium humans are the intermediate hosts (where asexual reproduction takes

Q. List the tissues of pancreas? The pancreas is made up of two types of tissue: The exocrine tissue secretes digestive enzymes. These enzymes are secreted into a network of

Definition of a neuropsychological test The best definition of a neuropsychological test has been offered by Ralph Reitan, who described it as a test that is sensitive to the

What do you mean by branchial basket? In ascidian adults the pharynx is enlarged to form branchial basket. Pharyngeal openings in wall of the basket allow water to pass through

During which meiosis division does ploidy reduction occur? Does ploidy reduction occur in mitosis? In the cell division by meiosis ploidy reduction occurs in meiosis II. Initia

Aging population is an important factor to be considered in implant dentistry. Life expectancy has increased significantly past the age of retirement. Social pleasures continue thr

What is the physical experiment that show that the protoplasm has contractility?

Agrostology : This is related to all types of grasses. Agrostology is sometimes called as graminology. Agrostology is the scientific study of grasses. It typically encompasses the

Shoot Multiplication -Clonal Propagation This is the most important step with respect to the rate of propagation and genetic uniformity of the product. The most reliable and